setBlockType makes error

Plugins Plugin Development
1

Sponge Build: 1.11-6.0.0-BETA-174
Java Version: Java 8 (I use jre1.8.0_112

I need to listen the TickBlockEvent event, next to getTargetBlock(), and if this block is equals some block, to change it by setBlockType(). But this makes red text and I dont know what I need to do to repair it.

Block of code 
@Inject
private Logger logger;

private World world;

@Listener
public void onTick(TickBlockEvent evt)
{
	BlockSnapshot block = evt.getTargetBlock();	
	if(block.getState().getType().equals(BlockTypes.GRAVEL))
	{
		logger.info(block.getPosition().toString());
		world.setBlockType(block.getPosition(), BlockTypes.AIR);
	}
Server Logs

[23:39:08] [Server thread/ERROR] [Sponge]: Could not pass TickBlockEvent$Scheduled$Impl to Plugin{id=myfirstplugin, name=myPlugin, version=1.0, source=mods\MyPlugin.jar}
java.lang.NullPointerException
at MyPlugin.Main.onTick(Main.java:36) ~[Main.class:?]
at org.spongepowered.common.event.listener.TickBlockEventListener_Main_onTick3.handle(Unknown Source) ~[?:?]
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:305) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:320) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:144) [SpongeImpl.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.tracking.TrackingUtil.updateTickBlock(TrackingUtil.java:222) [TrackingUtil.class:1.11-6.0.0-BETA-174]
at net.minecraft.world.WorldServer.redirect$onUpdateTick$zjf000(SourceFile:732) [lw.class:?]
at net.minecraft.world.WorldServer.func_72955_a(SourceFile:645) [lw.class:?]
at net.minecraft.world.WorldServer.func_72835_b(SourceFile:215) [lw.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(SourceFile:178) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(SourceFile:335) [lh.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(SourceFile:562) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:466) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_112]

2

Without seeing your full code (and thus, line numbers), I can’t give you a complete answer, but I assume world is null in your code because you don’t actually set it. You probably want the block’s original world anyway, so try changing the line

world.setBlockType(block.getPosition(), BlockTypes.AIR)

to

block.getLocation().ifPresent(loc -> loc.getExtent().setBlockType(block.getPosition(), BlockTypes.AIR));

(note that getLocation returns an Optional, but I suspect this is only empty if the world in question isn’t loaded, which if the block is ticking, it always should be!)

3

It’s all code of my plugin except imports etc.

I did it but I get the same error.

Error in console

[00:32:20] [Server thread/ERROR] [Sponge]: Could not pass TickBlockEvent$Scheduled$Impl to Plugin{id=myfirstplugin, name=myPlugin, version=1.0, source=mods\MyPlugin.jar}
java.lang.NoSuchMethodError: org.spongepowered.api.world.World.setBlockType(Lcom/flowpowered/math/vector/Vector3i;Lorg/spongepowered/api/block/BlockType;)V
at MyPlugin.Main.lambda$0(Main.java:36) ~[Main.class:?]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_112]
at MyPlugin.Main.onTick(Main.java:36) ~[Main.class:?]
at org.spongepowered.common.event.listener.TickBlockEventListener_Main_onTick3.handle(Unknown Source) ~[?:?]
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:305) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:320) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:144) [SpongeImpl.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.tracking.TrackingUtil.updateTickBlock(TrackingUtil.java:222) [TrackingUtil.class:1.11-6.0.0-BETA-174]
at net.minecraft.world.WorldServer.redirect$onUpdateTick$zjf000(SourceFile:732) [lw.class:?]

4

No, that’s a different error, you got a NullPointerException before, you now get a NoSuchMethodError, which means that you’re (probably) compiling against a different version of the Sponge API, I hadn’t realised that your setBlockType definition was wrong. Make sure you’re compiling against API 6, then have a read of this JavaDocs page to see how to use setBlockType.

If you need a bit more info on Causes (which you will require), see http://docs.spongepowered.org/master/en/plugin/event/causes.html

5

Yes, I had 4.0.3 API version in my pom.xml, thank you for your prompt. I wrote 5.0.0 instead, and NoSuchMethorError isn’t yet.

But 5.0.0 API need a Cause in setBlockType() as 3rd argument. What I need to write in this place to make it working? I wrote evt.getCause(), but it makes error

Error with evt.getCause()

[01:30:51] [Server thread/ERROR] [Sponge]: Could not pass TickBlockEvent$Scheduled$Impl to Plugin{id=myfirstplugin, name=myPlugin, version=1.0, source=mods\MyPlugin.jar}
java.lang.IllegalArgumentException: PluginContainer must be at the ROOT of a cause!
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:125) ~[minecraft_server.1.11.jar:?]
at net.minecraft.world.WorldServer.setBlock(SourceFile:943) ~[lw.class:?]
at net.minecraft.world.World.setBlock(SourceFile:349) ~[ajq.class:?]
at org.spongepowered.api.world.extent.MutableBlockVolume.setBlockType(MutableBlockVolume.java:97) ~[MutableBlockVolume.class:1.11-6.0.0-BETA-174]
at org.spongepowered.api.world.extent.MutableBlockVolume.setBlockType(MutableBlockVolume.java:80) ~[MutableBlockVolume.class:1.11-6.0.0-BETA-174]
at MyPlugin.Main.lambda$0(Main.java:31) ~[Main.class:?]
at java.util.Optional.ifPresent(Unknown Source) ~[?:1.8.0_112]
at MyPlugin.Main.onTick(Main.java:31) ~[Main.class:?]
at org.spongepowered.common.event.listener.TickBlockEventListener_Main_onTick3.handle(Unknown Source) ~[?:?]
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:305) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.SpongeEventManager.post(SpongeEventManager.java:320) [SpongeEventManager.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:144) [SpongeImpl.class:1.11-6.0.0-BETA-174]
at org.spongepowered.common.event.tracking.TrackingUtil.updateTickBlock(TrackingUtil.java:222) [TrackingUtil.class:1.11-6.0.0-BETA-174]
at net.minecraft.world.WorldServer.redirect$onUpdateTick$zjf000(SourceFile:732) [lw.class:?]
at net.minecraft.world.WorldServer.func_72955_a(SourceFile:645) [lw.class:?]
at net.minecraft.world.WorldServer.func_72835_b(SourceFile:215) [lw.class:?]
at net.minecraft.server.MinecraftServer.func_71190_q(SourceFile:178) [MinecraftServer.class:?]
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(SourceFile:335) [lh.class:?]
at net.minecraft.server.MinecraftServer.func_71217_p(SourceFile:562) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer.run(SourceFile:466) [MinecraftServer.class:?]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_112]

I tried to hide code in spoiler, but it isn’t work always.
I’m in one step near win, I hope.

Yes, I know, my English is very bad, excuse me.

6

Don’t worry about the language, I can understand you!

I urge you to read the Docs at your leisure, they are available in a variety of languages, and hopefully will help you in the future - http://docs.spongepowered.org/

As for your current problem: “PluginContainer must be at the ROOT of a cause!” - you’ve perhaps guessed your Cause is wrong. It wants you to create your own cause, which has the class with the @Plugin annotation on it. So, in your case, change evt.getCause() to Cause.of(NamedCause.source(this)). Hopefully then, you should be good to go.

(I use NamedCause.source here as I think of the event’s source as being your plugin - others might disagree with me!)

7

If I do only this, I get the same error “PluginContainer must be at the ROOT of a cause!”.
I don’t know how to create my own cause, I’m full newbie in minecraft coding.

I read it, but it is worry translated to my language, much of text isn’t translated.

8

Mind linking your code or a snippet of the code in question? Also if you tell us your language I might be able to help with the missing text on the docs. Best of luck!

1 Like
9

Change it to: world.getLocation(v).setBlockType(BlockTypes.BEDROCK,
Cause.source(Sponge.getPluginManager().fromInstance(plugin).get()).build());

And it can’t be called any earlier then: GameStartingServerEvent event because thats when the worlds are loaded.

v is a Vector3i variable.
plugin is an instance of the plugin. (Also on a different class) If this is in your main class, use ‘this’ else